On Mon, 2008-04-21 at 01:18 +0200, Domenico Andreoli wrote: > as soon as I booted my dual PA8600 with 2.6.25 I got 1 CPU less. The> only other kernel I successfully used on that box is Debian's 2.6.22-3.> > Debian never built 2.6.23 for parisc, 2.6.24 was still hanging last> time I checked it, 2.6.25 did not even build until recent -rc. So I am> not in the best position to bisect.

Try this one; it's a corrected version of debian 2.6.24-1 for pariscsystems:

Unfortunately that doesn't tell us anything other than the start IPIfailed for some reason. One thing to try with the J series is a 32 bitkernel just in case: they're the only SMP systems that will boot 32bits, just in case you could try a 32 bit smp kernel.

As Dave Anglin said, it could be a config problem, although when I haveCPUs deconfigured by firmware, they usually don't show up in theinventory.